* ./src/libvlc.c: switched the position of msg_Create() and system_Init()

  * ./src/libvlc.c: switched the position of msg_Create() and system_Init()
    because the BeOS system_Init spawns a thread, which makes use of msg_*
    functions.
  * ./src/misc/threads.c, ./src/misc/win32_specific.c: put the detection
    of SignalObjectAndWait in the thread system initialization because
    system_Init() now happens after msg_Create().